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For long time I have been using hibernation instead of shutdown. I do normal shutdowns maybe twice a week if not less. After hibernation I always power off computer (from UPS button) because USB devices stays working.

I don't know what happened but now my PC isn't shutting down after falling to hibernation. It justs restarts. But restarts with delay of 1/2 seconds (not sure). I don't know what's wrong. Problem from hardware level or OS problem? Maybe it's because of overclocking that I failed (computer just froze up and I was forced to reset CMOS)? Also no problems were indicated by Memtest86+.

Windows XP PRO SP3 with latest updates of course
Motherboard - Gigabyte GA-945PL-S3
CPU - DualCore Intel Core 2 Duo E4300, 1800 MHz (9 x 200)
Video card - Gigabyte GeForce 7200 GS

Edit
14.12.11
I noticed that computer does turn off, but not the motherboard. I can hear that HDD shudowns off.

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Have you tried a System Restore to go back to a point when it was working? Have you tried hibernating without any peripherals attached? – techie007 Dec 15 '11 at 22:06
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The manual for your motherboard can be found here Page 38 shows that the default setting for ACPI suspend type is S1/POS. Try changing this to S3/STR and see if that fixes the issue. This would have been caused by your reset of the CMOS.

For reference, this wikipedia article explains the different S states.

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Nope. Didn't work. :( What's wrong? – Roberts Dec 16 '11 at 21:55
@roberts I just looked at your profile and see that you do not have the machine in question listed, so I can't tell how much RAM you have. If you have 1GB of RAM, [this Hotfix] (microsoft.com/download/en/details.aspx?id=414) may apply. There are a number of other things to attempt [on this page] (support.microsoft.com/kb/907477) that may help. Also, if you can check your event log and see if there are any error messages that may relate to this problem? – WinOutreach4 Dec 19 '11 at 21:22
Yes I have only 1 gig of RAM. And I don't have Service Pack 2, I have SP3 - hotfix failed. – Roberts Dec 19 '11 at 21:25
Did you try any of the things on the second page I linked? Did you check the event log to see if there is anything listed that might apply to this issue? – WinOutreach4 Dec 20 '11 at 21:16
Something with Windows XP... – Roberts Dec 20 '11 at 21:42
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